Radiation fin set for heat sink

ABSTRACT

A radiation fin set comprising a plurality of metallic radiation fins arranged in parallel for direct welding/bonding to a beat dissipation base panel or mounting on a heat dissipation tube at the heat dissipation base panel, the radiation fins each having a plurality of elongated slots and a plurality of flanges respectively extended along one side of each of the elongated slots and sloping in one direction at an angle of slope for guiding the flow of air of high momentum into mixing with the flow of air of low momentum to repress the formation of boundary layer and to improve heat dissipation efficiency of the radiation fins.

BACKGROUND OF THE INVENTION

[0001] The present invention relates to heat sinks and, morespecifically, to a radiation fin set for heat sink, which causes theflow of air of high momentum to mix with the flow of air of lowmomentum, so as to repress the formation of boundary layer and toimprove heat dissipation efficiency of the radiation fins.

[0002] Following fast development of computer industry, a variety ofhigh-precision electronic elements have been developed. High-precisionelectronic elements achieve high operation speed, however theysimultaneously produce much heat. Because electronic elements must beoperated within a designed working temperature range, heat must bequickly dissipated during their operation. Various heat sinks andradiation fin designs have been disclosed for this purpose. FIG. 1 is anexploded view of a heat sink according to the prior art. This structureof heat sink comprises a heat dissipation base panel 3 a for fasteningto an electronic element that produces heat during its operation, a heatdissipation tube 2 a fixedly fastened to the heat dissipation base panel3 a, and a metallic radiation fin set la fastened to the heatdissipation tube 2 a and arranged in parallel. The radiation fin set 1 ais comprised of a plurality of radiation fins 10 a, each having athrough hole 11 a for the passing of the heat dissipation tube 2 a. Thisdesign of radiation fin set la is still not satisfactory in function. Asshown in FIG. 2, the quantity of motion of the flow of air 12 a isgradually reduced near the downstream of the radiation fins 10 a,forming a boundary layer 13 a in between each two adjacent radiationfins 10 a. When the boundary layer 13 a becomes thick, it blocks theheat dissipation passage between each two adjacent radiation fins 10 a,resulting in low heat dissipation efficiency.

SUMMARY OF THE INVENTION

[0003] The present invention has been accomplished to provide aradiation fin set for heat sink, which eliminates the aforesaid problem.It is the main object of the present invention to provide a radiationfin set for heat sink, which causes the flow of air of high momentum tomix with the flow of air of low momentum, so as to repress the formationof boundary layer and to improve heat dissipation efficiency of theradiation fins. It is another object of the present invention of thepresent invention to provide a radiation fin set for heat sink, whichprevents the formation of wind resistance and improves the efficiency ofthe dissipation of heat. According to one aspect of the presentinvention, the radiation fin set is comprised of a plurality of metallicradiation fins. The radiation fins each have a plurality of elongatedslots, and a plurality of flanges respectively extended along one sideof each of the elongated slots and sloping in one direction for guidingthe flow of air of high momentum into mixing with the flow of air of lowmomentum to repress the formation of boundary layer between each twoadjacent radiation fins. According to another aspect of the presentinvention, the sloping flanges of the radiation fins each have at leastone air vent for the passing of air to prevent formation of windresistance.

BRIEF DESCRIPTION OF THE DRAWINGS

[0004]FIG. 1 is an exploded view of a heat sink constructed according tothe prior art.

[0005]FIG. 2 is a schematic drawing illustrating the formation ofboundary layer between each two adjacent radiation fins according to theprior art.

[0006]FIG. 3 is an exploded view of a heat sink constructed according tothe present invention.

[0007]FIG. 3A is an enlarged view of part A of FIG. 3.

[0008]FIG. 4 is an assembly view of FIG. 3.

[0009]FIG. 5 is a schematic drawing illustrating the formation ofboundary layer between each two adjacent radiation fins according to thepresent invention.

[0010]FIG. 6 is a perspective view of an alternate form of the heat sinkconstructed according to the present invention.

[0011]FIG. 7 is an elevational view of an alternate form of theradiation fin according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0012] Referring to FIGS. 3, 3A, and 4, a radiation fin set 1 isfastened to the front end 20 of a heat dissipation tube 2. The radiationfin set 1 is comprised of a number of metallic radiation fins 10arranged in parallel. The radiation fins 10 each have a through hole 11through which the front end 20 of the heat dissipation tube 2 isinserted to secure the radiation fins 10 in parallel, keeping theradiation fins 10 spaced from one another at an equal space. The heatdissipation tube 2 has a rear end 21 fixedly fastened to a positioninggroove 30 on the top sidewall of a heat dissipation base panel 3. Theheat dissipation base panel 3 is fastened to the top sidewall of anelectronic device, for example, a CPU 4. During operation of the CPU 4,heat is quickly transmitted from the CPU 4 through the heat dissipationbase panel 3 and the heat dissipation tube 20 to the radiation fin set1, and then dissipated into the air from the radiation fin set 1.

[0013] The radiation fins 10 each have a plurality of elongated slots 12and a plurality of flanges 13 respectively extended along one side ofeach of the elongated slots 12 and sloping in one direction at an angle14. The flanges 13 are formed of a part of the respective radiation fin10 upon formation of the respective elongated slots 12 by stamping. Theangle of slope 14 of the flanges 13 is within 20-45°, or preferably 30°.

[0014] Referring to FIG. 5, when the quantity of motion of the flow 15is reducing, the thickness of the boundary layer 16 is relativelyincreased, and the flow of air of high momentum 17 is guided through theelongated slots 12 of the radiation fins 10 to mix with the flow of airlow momentum 18 to repress and destroy the boundary layer 16 betweeneach two radiation fins 10, preventing blockage of heat dissipationpassage. Thus heat can be quickly dissipated from the CPU.

[0015]FIG. 6 shows an alternate form of the radiation fin set 1 on theheat dissipation base panel 3 according to the present invention.According to this arrangement, the radiation fins 10 are directly welded(or bonded) to the top sidewall of the heat dissipation base panel 3without the use of the aforesaid heat dissipation tube 2.

[0016] Referring to FIG. 7, air vents 19 are formed through the flanges13 of the radiation fin 10 for the passing of currents of air. Thenumber of the air vents 19 on each flange 13 is determined subject tothe size of the flanges 13.

[0017] A prototype of radiation fin set has been constructed with thefeatures of the annexed drawings of FIGS. 3˜7. The radiation fin setfunctions smoothly to provide all of the features discussed earlier.

[0018] Although particular embodiments of the invention have beendescribed in detail for purposes of illustration, various modificationsand enhancements may be made without departing from the spirit and scopeof the invention. Accordingly, the invention is not to be limited exceptas by the appended claims.

What the invention claimed is:
 1. A radiation fin set comprising aplurality of metallic radiation fins arranged in parallel, saidradiation fins each having a plurality of elongated slots and aplurality of flanges respectively extended along one side of each ofsaid elongated slots and sloping in one direction at an angle of slope.2. The radiation fin set of claim 1 wherein said radiation fins eachhave a through hole respectively aligned for mounting.
 3. The radiationfin set of claim 1 wherein the angle of slope of said flanges is 30°. 4.The radiation fin set of claim 1 wherein said flanges each have at leastone air vent for the passing of air.